func presentQRCode(pl meddler.Payload, res http.ResponseWriter, req *http.Request) {
foundKeySet, err := lookUpKeySet(pl.PublicKey)
if err != nil {
http.Error(res, fmt.Sprintf("encountered error: %v", err), 400)
return
}
if foundKeySet == nil {
panic("null keySet returned from publicKeyLookup")
}
rawTextForSigning := pl.RawTextForSigning()
if !foundKeySet.Match([]byte(rawTextForSigning), []byte(pl.Signature)) {
http.Error(res, "invalid signature", 403)
return
}
curTimeUnix := time.Now().Unix()
if pl.ExpiryTime < curTimeUnix {
http.Error(res, fmt.Sprintf("request expired at %q, current time %q", pl.ExpiryTime, curTimeUnix), 403)
return
}
uri := pl.URI
code, err := qr.Encode(uri, qr.Q)
if err != nil {
fmt.Fprintf(res, "%s %v\n", uri, err)
return
}
pngImage := code.PNG()
fmt.Fprintf(res, "%s", pngImage)
}
func main() {
var strChan chan string
if len(os.Args) < 2 {
strChan = freadLines(os.Stdin)
} else {
strChan = linesThroughChan(os.Args[1:]...)
}
for url := range strChan {
url = trimStripLine(url)
code, err := qr.Encode(url, qr.Q)
if err != nil {
fmt.Fprintf(os.Stderr, "%s %v\n", url, err)
continue
}
pngImage := code.PNG()
base := path.Base(url)
rawPath := fmt.Sprintf("%s.png", base)
f, err := os.Create(rawPath)
if err != nil {
fmt.Fprintf(os.Stderr, "open %s %v\n", rawPath, err)
continue
}
fmt.Fprintf(f, "%s\n", pngImage)
f.Close()
}
}
func presentQRCode(pl meddler.Payload, res http.ResponseWriter, req *http.Request) {
if pl.PublicKey != envKeySet.PublicKey {
http.Error(res, "invalid publickey", 405)
return
}
rawTextForSigning := pl.RawTextForSigning()
if !envKeySet.Match([]byte(rawTextForSigning), []byte(pl.Signature)) {
http.Error(res, "invalid signature", 403)
return
}
curTimeUnix := time.Now().Unix()
if pl.ExpiryTime < curTimeUnix {
http.Error(res, fmt.Sprintf("request expired at %q, current time %q", pl.ExpiryTime, curTimeUnix), 403)
return
}
uri := pl.URI
code, err := qr.Encode(uri, qr.Q)
if err != nil {
fmt.Fprintf(res, "%s %v\n", uri, err)
return
}
pngImage := code.PNG()
fmt.Fprintf(res, "%s", pngImage)
}